hikaricp - 如何获取 HikariCP 的事件连接数

Question

我试图记录当前事件连接的数量。我正在使用 com.zaxxer.hikari.HikariJNDIFactory作为我的数据源工厂。

final Context context = new InitialContext();
HikariConfig hikariConfig = new HikariConfig();
hikariConfig.setDataSource((DataSource) ((Context)context.lookup("java:comp/env")).lookup("jdbc/mydb"));
HikariPool hikariPool = new HikariPool(hikariConfig);
LOGGER.log(Level.INFO, "The count is ::" + hikariPool.getActiveConnections());

但它抛出以下异常:

java.lang.RuntimeException: java.lang.NullPointerException
        at com.zaxxer.hikari.util.PoolUtilities.createInstance(PoolUtilities.java:105)
        at com.zaxxer.hikari.metrics.MetricsFactory.createMetricsTracker(MetricsFactory.java:34)
        at com.zaxxer.hikari.pool.HikariPool.<init>(HikariPool.java:131)
        at com.zaxxer.hikari.pool.HikariPool.<init>(HikariPool.java:99)
        at com.something.servlet.HikariConnectionCount.doGet(HikariConnectionCount.java:35)

哪里 HikariConnectionCount.java是我写的文件

Answer 1

此处记录了编程访问 https://github.com/brettwooldridge/HikariCP/wiki/MBean-(JMX)-Monitoring-and-Management